But you don't mean to say that the "masses" by and large incline rightward (and thus put pressure on the main TV channels to serve up more right-friendly fare), do you? Truth unfolds in time through a communal process.
The chief managers are quasi-political appointees (meaning they are professionals but chosen for the side they lean towards) and the heads of news/magazines/political interview and debate programmes are carefully picked, along with news anchors etc. No one's around who might rock the boat politically, unless it's after midnight... ;) The left under Mitterand did the same (so it's not response to demand), but it's true the right has tended to view the Republic as their property, and public broadcasting with it, in a more consistent way throughout the half-century of the Ve Republic.